Steam shovel or excavating-machine.



Nn. 7I 6,538,. Y Patented Dec. 23,A |902..`

' C. M. HARRISON.

STEAM SI'IDVEL 0R EXGAVATING MACHINE.

(Applicativi: lsd Mal'. 7, 1902.)

(No Model.)

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CHARLES M. HARRISON, OF NAPOLEON, OHIO.

STEAM Sl-lOVEL OR EXCAVATING=NIACHINE.

SPECIFICATION forming part of Letters Patent No. 716,538, dated December23, 1902.

Application tiled March 27,1902. Serial No. 100,350. (No model.)

To all whom, t may concern:

Beit known that I, CHARLES M. HARRISON, a citizen of the United States,residing at Napoleon, in the county of Henry and State of Ohio, haveinvented certain new and useful Improvements in Steam Shovels orExcavating-Machines; and I do declare the following to be a full, clear,and exact description of the invention.

My invention relates to an improvement on the main boom of a steamshovel or excavator, and is especially adapted to a steam shovel orexcavator with a secondary boom, shovel, and shovel-arm and with pivotalconnections between the secondary boom and shovel-arm, as covered byLetters Patent No. 671,925, issued by Patent Ofice of United States.

The objects of my improvement are, rst, to increase the distance ofprojection and retraction of the secondary boom and shovel when attachedto a pivotal main boom; sec ond, to permit the shovel to work at a muchlower level; third, to remove the necessity of swinging the engines,boilers, drums, dac., as in said Patent No. 671,925 aforesaid. I attainthese objects by a framework illustrated by the accompanying drawings,in Which- Figure l is a side elevation, in which A is the main boom ascommonly used in steamshovels. B is a framework descendingr in a more orless vertical direction from the main boom A until it intersects theframe C, which extends from the pivotal base of the main boom A in amore or less horizontal direction, intersecting the frame B at F, wherethe conjunction of the two form the bracket B F O. The frames B and Cmay either form a part of the main boom A or be constructed out ofseparate material and attached to the main boom A between the lines Band C by welding, rivets, bolts, or other means. The frames B and O maybe attached in a similar manner at their intersection F. E is a shaft oraxle resting,r upon suitable bearings at or near F and attached to whichare the pinions or cogs, which iit into the cogged rack attached to thesecondary boom D in the usual Way. By means ofthe crowding-engine ormotive power G and cog-gearing as commonly used the secondary boom D isadvanced or retracted by rotating the axle E.

Fig. 2 is a front elevation with shovel and shovel-arm detached. A and care the main boom as commonly used in steam shovels or excavators. B ando show a front View of the vertical framework of the bracket B F C,while O and c show the end view of the transverse sections of thehorizontal frames of the bracket B F C. E is the axle or shaft, restingupon suitable bearings at or near F and fand upon which are placed thepinions or coge, which fit into the cogged rack on secondary boom D andd, which is projected or retracted by crowding engines or motive powerand gearing as commonly used on steam shovels or excavators. H is abrace between the frames O and c.

Having described my invention, what I claim, and desire to secure byLetters Patent, 1s-

In au excavating apparatus the combination of a main boom having abracket extending below and forward therefrom, a secondary boom mountedto reciprocate upon an axle in said bracket, a shovel pivotallyconnected with the secondary boom and means for operating shovel andboom.

In testimony whereof I aflix my signature in the presence of the twowitnesses named below.

CHARLES M. HARRISON. Vitnesses:

W. W. CAMPBELL, LAURA II. CAMPBELL.

